Amazing find!! I've also been lurking this forum for old posts to help me identify bags but also to see old Marc bags that I'm not familiar with.
I actually just found a very rare vintage Marc bag on TRR last night because I had just seen it on an old PurseForum post! It's fall 2006 from the limited "Sweet Punk" collection, and the canvas pieces like mine were boutique exclusives.
It was priced so low because The Real Real marked it as fair condition for the hardware being chipped and the bag being scuffed, but that was done on purpose and they were always sold this way! Marc Jacobs also reissued this one in particular in 2017, but with some updates like a Marc Jacobs logo on the front of the new one and a slightly different shape.
The newer ones on TRR are priced similarly to the totes, like in the $200 range but I only paid $80 for mine, which is the original! It retailed for $695 at retail in 2006.
I've attached pictures of the original (left) and the reissue (right) for reference and I'll post pictures of mine when it comes!