Or at least they used the same key in the last month of their life for at least 2 vendors in the transactions I've seen.
To create a 2 of 3 multisig escrow address 3 pubkey is need: market, vendor, buyer
Hansa's pubkey was always the same:
02047fb81b818e7062f67becf3061cfd79eab5f0efed9f4643a3589a6765bedbff 1ArKP1KnNBWY4KA5SqhEWyu6cuLUEpZ18f
They used this pubkey in both 2of2 and 2of3 multisig transactions
This means:
The redeemScript can be recreated using this pub key. In case you forgot to save the redeemScript before Hansa went down then it was not possible to release funds from escrow. Using Hansa's pub key along with the vendor's and the buyer's pub key, the redeemScript can be recreated.
there might be a deadmen's switch that will release the market's priv key, so people can finalize their transactions even without having access to the other party's key. Obviously there might be a deadmen's switch even if they used a new pub key for every transaction, but it's still a good idea to save your own keys and tx data in the hope the market's key will be ever released somehow. There might be a Deadmen's switch or the admins get out of jail, or if the current algo gets compromised you might be able to release the coins from escrow.
Bitcoin might worth a lot more in the future so it might worth to keep a backup just in case.
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