I spent quite a bit of time knitting a jumper for my nephew's birthday. I posted it (we live the other side of the country from them) 'signed for' and I know they received it after checking the tracking number.
This was 2 days ago and I've still not heard from them, not even a text to say thanks.
I guess I wouldn't be so hacked off if it was a first, but it's not! I usually end up texting days later asking if the present was okay.
One year my gifts for 2 of their birthdays (sent first class recorded) were delivered exactly 10 days late...because Royal Mail in their area was having big problems...DB even told me this was the case & not to worry..all their post was late. A few months later it was my birthday. They apparently "forgot" to post my present...they eventually posted it... exactly 10 days after my birthday!! 
We're not really close, but have never fallen out. Due to living quite far away, we don't see each other much. They just don't seem that bothered about being in touch and I'm not sure I can be bothered anymore!!