The mess wouldn't occur from simply using an expired passport as ID. It would come from reporting a passport as lost when it really isn't.

A relative of mine has a friend who is a retired professional card counter. Until recently the friend traveled with documents for several different aliases (to get into casinos where he was banned). He had US passports in at least two names, which he obtained by applying for a passport in one name, legally changing his name, reporting the old passport as lost and applying for a new one in the new name.

A few years ago he got SSSSed and the TSA found his cache of IDs and credit cards in his carryon. He ended up pleading guilty to a federal felony as a direct result of that TSA search, and I'm 90% sure the charge was based on his intentionally defrauding the gov't by saying his old passport was lost when it really wasn't. Be warned.