If the MS chips you want to redeem are from
casinos in Natchez, Vicksburg, Greenville, Lula, Tunica or Philadelphia should be no problem they were not effected by Katrina and did not rerack.
Casino Magic (Biloxi and Bay St Louis), President, Grand Gulfport, Copa no longer exists. Large amount of chips in all denominations were remove from other casinos by salvagers and others (Palace, Beau Rivage, Grand) and have been seen in larger numbers with exception of Beau Rivage on EBay. IP, Palace, IOC and Grand Biloxi rerack when reopen. Treasure Bay currently have no table games. Hope this information helps. I do believe if you have any large denominations $25 and above, you may have to prove you had them prior to Katrina.