Put the $450 aside as a contingency for about a month. You're probably out of the woods but better safe than sorry.
And of course if he does contact you after the time is up, you have a moral issue to deal with.
Want: 2010 Allen & Ginter N43 relics of Pujols, Markakis, Howard. Want: Konerko high-end, looking for any Konerko 2012 Topps S1 1/1s
My buckets: https://sites.google.com/site/xl5inventory/ My shipping: DC and mailed next business day. My LCSs: Elite Sports Cards, Chicago; Tim's Baseball Card Shop, Chicago