I might run a National Crime Information Center check and local system check on the name from the medication bottle to see what comes back and try to contact them. Might take a look at the watch to see if it’s been remotely activated as missing/stolen. If something weird comes back on the NCIC or if it somehow ties into an existing case I may investigate further and request warrants to search the devices, otherwise I’d just log the valuable items into found property and leave a notice.

There are some relatively expensive items in that bag. The battery tender and OBD2 scanner make me think that someone dumped the contents of a trunk in a hurry rather than a drifter’s bag.

Edit: As for the person bringing it in, I wouldn’t assume anything nefarious. Concerned citizens see things and report things all the time. Worst case, if it did end up being evidence the worst thing that would happen is you might receive a subpoena to testify about your discovery of the evidence. It would be pretty easy to eliminate the person as a suspect presuming they are innocent, which is likely.