Kordoba's way to duplicate and retrieve items/money, a cheat
First go to your latest savegame and drop on the ground everthing you do not want to lose(from inventory and Equipment) Quest items for sure. Do not drop your Pyramids on the ground and also make sure both pyramids are in your inventory. Drop your money too . Now save this as a test savegame. (just in case)

Now go back to a savegame where you do have the item you lost. eg. explosive keg. Now go to your savegame folders and copy all 6 INV items from your old savegame and copy and paste them into your testing savegame.

Now when you reload, your old savegame inventory will be in your new game. and all your good stuff will still be on the ground.

Other things to note before making this transfer.
-Make sure you have 2 pyramids in inventory in both savegames.
-Make sure you don't have duplicate quest items on the ground so that when you make the transfer you don't have 2 of something, it may not hurt but I don't know what will happen.
-Make sure you use different saves from this point for a while because also I don't know whats gonna happen

NOW READ ON IF YOU WANT THE CHEAT OF THE CENTURY****************
Warning this could get ugly!
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Now if you already havn't figured this out, you can obviously make lots of duplicates of everything you own in this fassion. eg. you have 100000 gold. Drop your gold or whatever on the ground and make a second save, go to your folders and copy inventories, now when you reload you will have 100000 gold on the ground and 100000 gold in your inventory. Sounds sweet huh? well let me know if it works because i never tried it and I'm not going to because I don't cheat. I only fix things I was shafted out of!

Ok Ive done a little Testing and the Keg was a 100% Sucess and I'd recomend anyone to try this out thats lost theirs, its worth it because it not only sets your mind at ease that you completed the quests but the two sabatage missions are worth over 70000 xp
If anyone wants their explosive keg back but do not have a prior save with the keg I can send them my INV files with nothing but the Keg in the Inventory. Alls you would have to do is drop all your items before overwriting the INV files and pick them up again after.