Heck, with all the space junk out there falling back to earth everyday, it probably is. space junk survives reentry everyday, but most ends up in the oceans. And, no, there does not have to be a crater, that would depend on so much, angle of entry, weight, if it hit a tree first, ect. Freashly fallen meteorites (one of my hobbies) are found on top of the ground too. do a google image search for fallen space junk
But It should of made a sonic boom though as it came through the atmosphere. So, my guess, it is a torque converter from a 57' Chevy that blew up it's transmission.