I have consigned with them several times and been OK. Sent in a few scarves in November, and their pricing for on CSGM was ridiculously low, so I requested it be sent back to me. I decided that for that pow commission, I'd try to love it, since I really wanted one with that predominant color. They've apparently lost it! I have documentation that they had it BUT they want to do a "buy out", meaning paying me the commission I would've received had it sold. I find that unacceptable, a) because their pricing was ridiculous, and b) now I'll have to buy a new one, or hunt for a pre-loved one; either way, the $400 they propose is not getting me very far.
As an aside, I have found that my knowledge of Hermès is far deeper than theirs, especially among ID'ing leathers and super-popular scarf designs (which they should price at a premium).
How much compensation would you ask for?