Obviously the nephew and the OPs are a not suspects.
"My nephew went for a quick look around our neighbourhood and found another wallet tossed over a wall, it still had money in so we have handed it to the police"
Oh excuse me, are only Turks suspect here. I mean,who would know that all this stuff was insured?? How could the average "Turkish" thief know the pin codes for the cards and leave the cash??? - crap!!
"Why would someone go to the length of stealing a wallet, and then toss it over a hedge with the money still there?
What were they looking for? " NO ANSWER TO THAT WAS THERE??
So, there was a wallet found with only cash in it, nothing else to identify it. Obviously it was not the OP's as he would have said, wouldn't he?? Or is this a scam they want qualified by CBFT?
Question - Were all receipts in the wallet??
Answer - "Yes we have reported it but our insurance company want exchange receipts and bank receipts but the exchange receipts were in the wallet and we paid cash for our lira anyway!"
Oh Perlease!!! Insurance costs us a lot, these people will cost us more. It is plainly obvious that they are using this forum to enhance their claim. If you believe them well, you had better these and others are obviously going to benefit from these illegal claims.