what was the thing dylan took from O&D that Milchick was so concerned about?

i feel like after this scene happened we basically just moved on since the most surprising part was the fact that Milchick was able to activate Dylan's innie within the outie world (and that outie Dylan had children) but what was so important about the thing Dylan took?

was it just the fact that Milchick assumed he took it to the outie world with him and could've made outie dylan question the innie world if he saw it? almost like something that was able to get through the code detectors because it had no words?

or was it something that is actually super important to the function of the company and needed to be located and returned? if you think the latter is the case, what do you think it's importance is?

i'm not sure we'll ever get an answer unless its talked about again in season 2 (or in the podcast, i havent gotten that far) but what theories do you guys have?