At the moment, it's impossible for an admin to correlate if an autoblock id is in fact affecting a said user/ip. I know there has been privacy problems, but some ways I think could be fixed to help this issue, as for the moment, unblocking an autoblock is a fully blind operation by an admin, the admin cannot see IF in fact the ip is autoblocked, and it's really difficult to lookup the autoblock in question.
Alternative 1 is a way to be possible to check IF an ip is autoblocked by a particular autoblockid ( auto_id(ip) == id );
Alternative 2 could be to make an translation table for autoblock ids where a blocking creates an hidden id; and a public id is visible but is only connected to the autoblocked ip, and not traceable to the original block.
T55008: MediaWiki:Autoblocker etc. reveals to third party that a (blocked) user has used the same IP address
T7445: Remove autoblocks when a user is unblocked