that's a shame.. within a few weeks the kart has been totally disassembled, repainted, the parts have already been sold and it's running (now black) with a different motor on now silver or white wheels.
You'll never be able to recognize it even if it's at your front door
A few days is not a problem, one week is hard.. a few weeks nearly impossible...
One chance though:
There's a guy on CL (maine area) selling a go kart (no further info than that)
asking for 900$ near portland... (posted 24 days ago)
70 miles.. not impossible.
Ask him for a pic and see what you got
Also, check all classifieds on a daily basis on the lowest restricting search terms (maybe just kart for example) and see what comes up..
sometimes you'll only find the engine popping up and can trace it down to the one you want to inform about the rules of personal property
'sid