Ah, well:
1st off, there are 2 kinds of IDs: The item ID, which can be found in the itemtype.dat file and the "unique ID" of an item.
Generally, the items in your inventory are stored in memory in the same form as are the items that you wear or the items in a market stall.
For each item, there is a part of memory where its stats are present, starting with Item ID, then unique ID, then item name, and so on. So, you can try it like this:
Start Cheatengine, load conquer process.
Look up the item idea of one item in your inventory in a decrypted itemtype.dat (Decrypters are around).
Now search for this ID using Cheatengine. You'll get a bunch of addresses. Most of them are from the loaded itemtype.dat, skip that range of memory.
Using Right click --> Browse this memory region for the addresses you found, try to find out that range of memory you are looking for. It takes some time to find it, but as your proficiency rises it will get easier

You can also try to add the addresses you found to your cheattable (if there are too many it will probably screw your PC), and do another search for another value of your item, like, max attack, or strength or so. After doing this, look which of your newly found addresses is close by one of the 1st search.
Hope I could help.
Jalan