I was in Thailand recently, and before my return flight someone sent me $200 through Western Union to shop for some items for them. It was a pain to pick up the money.
First I went to a Bangkok Bank branch just near my accommodation where I dealt with a very obnoxious female staff. While filling out the form, she was taking pictures of me with her phone, then I noticed that after making a copy of my passport, she kept it away from where I could reach for it instead of handing it back.
Then she asked me to sign the photo copy and she took the passport and was looking at the signature and how I was signing, even though I'd already signed the same signature on the western union form. By this time I was really pissed, but held my peace.
After all the drama, she dialed a number and was telling someone she won't be paying out because my middle name was missing from the transaction. So I reached out to where she'd kept my passport and took it, but as I was standing up, she tried to grab my phone which was on her desk. I was lucky I spotted her. I picked up the phone and announced I was going to Central.
Big mistake! They called central to alert them before I got there, and the cashier said I needed 2 forms of ID to pick up the money.
Very annoyed and frustrated, I left and went to the post office to pick up the money. The reason for the long winded explanation to to let the OP know that it's not easy for someone else to pick up the funds without collusion.