I don't do real anger IRL - I save my Victor Meldew moments for dramatic effect 
. But I've gone past being miffed to bloody annoyed today to just a bit wound up at the moment!
So not so much of an AIBU (although you can tell me if am) more of a "give me a subtle and diplomatic form of words for tomorrow"
Back story - had a lot of building work done in the house necessitating a massive clear out of all that stuff you may keep.
I had a very expensive set of Disney books, roughly £300 worth plus a complete set of republished Ladybird ABC books, which were used by my 3 boys. All still immaculate (no turned corners, no broken spines, scribbles etc) because this is a book loving house. So they ranged from pre-school learning the alphabet, to building upon it and through to roughly aged 9 (ish) - and they were predominantly male orientated books.
My children have outgrown those books and I'm beyond cluttering the loft for 10 years in case grandchildren appear.
As you know I work in a school, which has a high SEN in take, many children still have a reading age of 5-7 despite being in Y9. I spoke with one of the lead LSAs - lovely, she said, bring them in, our books are a bit shoddy.
Took them in this morning, left them with the other lead LSA (who knew I was donating these books to the SEN Dept) with the comment "these are the books I promised you (on Monday) I've brought in for the (SEN) department".
I walked past the SEN dept 10 mins later, several TAs and one lead LSA on the floor stuffing books in handbags 
I said "what are you doing?"
LSA "my grandson will love these"
Me: "I brought these in for the department"
LSA: "but my grandson will love these"
Me: cats arse face "I...donated...these to the the department
LSA: "but they are lovely, my grandson will love these"
Me: I think you misunderstood, I donated these for your 1-2-1
2 literacy time - TBH they are worth in excess of £300 - I could have sold them on eBay"
TA: "I'll buy you some chocolates!!!!" 
Me: sarcasm mode "I need wine to get over this"
TA: "ok,wine it is then"
ME: (to the LSA) "I brought these in for the literacy time"
LSA "I know, but my grandson will love these"
Me: "you are missing the point - I donated these - I could have sold them if I didnt want them to be properly used"
LSA: "but my grandson will love these!"
I'm bloody annoyed. I think I was clear enough in what I said, and tone and facial expressions......... oh and the TA was leaving tonight with a heaving carrier bag, which she saw me pointedly looking at ....and said "I won't forget your wine tomorrow"
Do I
(A) accept that some children will benefit from those books and let it go and chalk it up to experience?
(B) see the SENCO tomorrow
in a bit of a catch 22 - the TA is by best mates SIL and the LSA and I work closely together at various points in the year and I need her good will for the smooth running of my job.
BUT! if either of them had said "Trois, those are lovely books, can I have a few please?" I would have willingly said yes.
As an aside, funding is short and these books would have enhanced the current curriculum reading schemes.