2083552304 is 7C307C30 in Hex. Ascii code 7C is the pipe symbol, |, and 30 is the number 0, so 7C307C30 is |0|0 which looks like serialised item data.
I should add that when I was working on the Bazaar, I was looking at some Live traces and *think* that I wasn't seeing item data being sent in a serialised format (didn't see any of those long strings of numbers separated by | symbols that are easy to spot in a packet trace). Maybe they stopped using that format for sending item data at some point.
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