Someone Sent Me Some Coins, Could Be A Mistake

[khaled0111]

^^
If we are talking about a lot of money, then most likely the person who sent that money will contact you and ask for a service in exchange or to send the money back.
The person who sent the coins must have got the address from somewhere (it can't be a typing mistake or something like that). So, it is possible to know who the owner of the address is or at least to which exchange it belongs.
Personally, I wouldn't move or spend those coins for as long as possible.