Generate series of random 6 digit numbers, that avoids potential off by one or transposition errors

I have an application where 6 digit numbers will be assigned for the purposes of physical access control. What I am having difficulty with is finding a way of avoiding single digit or transposition errors resulting in a valid PIN (from the series of PINs for that location). We'd be looking at needing no more 1000 PINs per location.

There is no ability to perform a checksum at the access control point, as it will simply lookup the PIN against a list of approved PINs.

Does anyone have any suggestions?