So I sent KillerPig Some coin items, but he didn't recieve the wings that I sent him, but It still took my coins. I was wondering maybe his gift box inventory was full, but I didn't want him to think I scammed him, so I sent ANOTHER pair of wings. This time he got it, but I barely have any coins now. This is now just happening AGAIN with Bubu2728. I sent him a coin head, wings, and a mini-bot, but he is saying he didn't recieve anything but the head. Although it STILL TOOK MY COINS. I would appreciate it if you could check the logs and refund me for the missing items, because... Well that's just not fair.

You're lying. Sorry.
You did send me on a nice half hour investigation. None of what you mentioned were in the logs.
And just to prove that the logs weren't false, I added them all up. You have had a total (all spent and still having) of 8750 coins. That amounts to an exact portion of 50$ and 30$.
No coins were lost. Have a nice day.