been following this thread. (sigh).
you know, in the grand scheme of things, this is not something to get all bent out of shape on (sorry for the choice of words).
dave is a young guy (I guess both of them are) and he just needs to realize that sometimes, saying "I was wrong and I'm sorry" is ALL it takes. sometimes.
you're young, hopefully you'll learn from this experience and you both can move on.
simplest thing: just swap each other's goods back. have a 3rd party receive both (first) and then send them back to the original owners.
then you guys walk away and the thing ends. and you BOTH get on with your lives.
these are material posessions. they don't matter in the big picture of life. if this is a 'problem', I'd hate to see what REAL problems in life will do to y'all (people have some real problems in life and this pales in comparison).
this is a deal that went bad due to lack of communication (amongst other things).
dave, please just accept the fact that you made a really bad judgement call. it happens. you are young (yes, you are) and you'll both recover and go on to live your lives.
move on. help this 'moving on' by swapping back the goods and ending it there.
and if the goods can't be swapped back, then at some point in time, just call the deal 'dead' and it seems the community is there to try to help offset (a little) of the hurt.
the important thing is to realize (dave) that its OK to make mistakes, even big ones; but that a boy who wants to grow to manhood also has to admit when he's wrong and try to make good (if possible). you will feel better, dave, once you return the goods; if not now, years later you'll realize it was the 'right thing'.