A creature enchanted with Minimus Containment stops being a creature. Equipment attached to that creature become unattached. Auras attached to that creature will be put into their owner's graveyard (unless they could also enchant a Treasure artifact).

If an effect refers to a Treasure, it means any Treasure artifact, not just a Treasure artifact token.

The enchanted permanent still retains its name, colors, mana cost, and mana value. It isn't a token unless it already was one.