I do not wish to disappoint you all but you really need to accept that you will not get the items back. You will not get compensated from Turbine directly. Sure, maybe once all the dust settles from the abomination that is U5 they will throw out a generic bone to all for the 'inconvenience' like extend a bonus xp or +1 loot weekend but that's it.
I am not trying to be a kill joy but this
HAS happened before and Turbine did nothing specific about it for anyone. Whether they actually can track what was missing or not, they do not have the time/resources/manpower/desire to actually replace every bodies missing stuff.
I am speaking as someone who also lost 5 items in returned ended auctions. I am also someone who lost items previously and was told by a Turbine CSR over the phone that they items would be returned once they sorted it out. Days went by and nobody ever got anything back, just a generic
"oops we screwed up, here's 3 days of +1 loot". Back when they first implemented the AH, if you posted an item with out a buyout price, someone could just buy it for 0 gp. They didn't anticipate this, it wasn't how they intended it to work, they did shut down auction and fixed it later. It was at that time that I lost several items so I called Turbine directly. The nice CSR assured me they had records of who had what and assured me they would give me the items back... it never happened. Their official stance changed a few days later. No item refunds would happen.
It will not be replaced. Accept the lesson learned (don't leave items in AH during updates) and move on a little wiser.
I wish I were wrong (always possible, if so I will publicly congratulate Turbine for the move) but 4 years of history says those items are
G O N E !
The sooner you accept this, the sooner you can get over it.