Imastawka,

 wrong answer!

Maybe there was a natural curiousity to see  "what stawka looks like" - but the main reason for handing it to you personally (rather than leave in the letterbox) would have been to ensure that you have received it, 100%.

Stalker?

Hardly - he lives near by, you know him now, can identify him, he sells on Ebay and presumably will continue to do so (in spite of the newly acuired defect).

You could have  opened the door, decided in one second flat he was hardly a threat, tell him: 

"Thank you so much, and it was very nice to have met you.  Very grateful, it'll save me few days waiting on my item."