There was a mention at the start that he got a delivery that had something to do with his biological parents, and suspected that Roxy had traced him from that. So you could go with that if you want.
It could generally be an access code to some dangerous resources, but they'd have to work to decipher it. I guess we can start to figure out a puzzle of some sort.
They could be spotted after spending some time looking at the contents of the disc (which would be encrypted, as discussed), so the action could come after that.