I didn't intend to post further on here after all the nastiness flying about, but wanted to thank those posters who had been supportive
and give an update as well as clearing up a few things......
DH has now called the person in question. They were completely fine about it, not in the least bit bothered and couldn't even remember what some of the items were. Between them they agreed to come up with a list of replacements (where possible the same titles, and where not the next best thing) which DH will source and pay for. Friend's DH said there is no urgency whatsoever and couldn't understand our concern that he'd be angry/upset - he is a very laid back guy. We've arranged to meet up soon regardless of where DH is at with getting the replacements sorted......no hard feelings whatsoever. I was so relieved I cried and DH felt pretty sheepish for upsetting me so badly.
I did say in my opening post that I feared DH had sold them, but whilst I said maybe "intentionally" what I meant was more along the lines of they'd perhaps got slipped in with other stock and DH had momentarily forgotten their origin - after all these were bog standard two-a-penny albums - I know that now from the list DH has from friend's DH. We have thousands of items pass through our hands and during our last move things got especially chaotic. DH is also a complete airhead and needs a secretary (me!) to remind him to do stuff like switch the heating off, let alone business matters. Not that I'm expecting most of you to believe this!
Not that it's anyone's business, but -
a) we do have a landline (and my friend has the no now)
b) we do Twitter and have a blog for business purposes, we plan to return to FB but as a business only.
c) I hate mobiles and don't see the need for both of us to have one, but will no doubt replace the one I recently let DH have in the near future
d) we enjoy restoring rambling old houses, although God only knows why as we rarely make a profit when we sell, but enjoy breathing life back into unloved buildings.
e) our house didn't 'become' unmortgageable during our ownership - we bought it while it was unmortgageable (we didn't need to borrow to buy it and haven't had a mortgage on our last three houses) as it was a ruin that had been partially restored with no kitchen facilities etc
f) in 2012 (I mistakenly thought it was 2011) my friend's DH asked DH to take the records home to research......he did so and found them to be worth very little which he explained to me at the time. I believe (but cannot be 100% certain) he told friend's DH this when they next spoke (FB which we were still doing then). He then stored them in a safe place in the office at our last house. Saw friend on two occasions - first time her DH was present and they discussed the fact the items were financially worth v little, but despite later coming to our house he didn't mention taking them home and TBH the rest of us were all rather tipsy (friend's DH was only one driving, before more accusations fly) so think my DH forgot to offer to return them (plus was rescuing friend from large bush).....second occasion was my dad's funeral. No mention of records as we were all otherwise occupied, grieving. Sometime between Dec 2014 and now they disappeared. Yes, DH should have offered to return them before, especially once it was established they were not going to be sold.....a mistake that has hopefully been learned from.
g) many records are worthless, even albums. DH has to throw many away from collections he purchases. Many people are delusional about what their collections/individual items are worth. Despite what many of you seem to believe, DH is well-respected in his field and has a reputation amongst other dealers/customers for being one of the good guys.
Now can we let this rest please?