that's a really nice try but not 100%. a nobo list shows shareholders that do not object to companies getting their name, address, phone number and shares owned.
here's several problems.
1 it isn't clear that uspr has ordered a nobo list recently, they certainly did not make it public that they did
2 any shareholder (convert holder or plain old shareholder) can decline to have his information on the nobo list. several convert guys i know do not allow their info to be shared for this exact reason
3 some convert holders/pro investors have multiple accounts and own shares in one account and make sales in others just to hide what they are doing.
so basically, again, there is no way for anyone to know other then the convert holder. anything else is pure speculation.