I've not seen anything saying his wallet, pants and boots were found near his body. Those things wouldn't all move at the same speed in the water, they likely would not stay with the body if peeled off by the current and everything wasn't likely to be peeled off by the current at exactly the same time.They said they found him with "identifying effects" or something like that. Unless his father was actually there to ID him like people've speculated, he probably had his wallet with him. If the wallet was on the pocket of the pants, the pants were probably near him and were recovered. But I'm assuming that from the info we have, and I could be 100% wrong. You've heard how it goes about assuming things...
Never have I ever seen police ID someone so fast like when they found Riley, and it being based only on his watch and shirt doesn't fit. Could be someone else wearing it.
Personally I doubt LE would have asked a family member to ID a body that had been in the water for weeks. I do agree the identification was fast. But his fairly distinctive shirt, watch, unusual height, and hair color were probably enough. Also it's possible LE had been told he was missing a tooth or had a gold crown far back in his mouth. (I'd think LE would have had dental charts on hand.) Or he could have had a birthmark LE knew about. Still, while it wasn't called a preliminary ID, it may have technically been one at the time it was announced it was Riley.
MOO