Did you try explaining the full situation to Internap as well (that your property is in their possession still) ? It's a complicated situation for sure, but it's possible they'll be able to work with you. At least, I've seen people in your situation come out alright in the past with other colocation resellers that have gone under.
Corey Northcutt | Northcutt Competitive inbound marketing with a hosting industry competency. Social | Content | Optimization | Outreach
I have briefly explained the situation but I will definitely mail to Internap again with a little more details.
The problem is that we haven't had contact since 2007 and I have no idea when they went out of business. It must be a while, the lady who got their old phone number told me she's got it for 6 months already and I was not the only one asking for Aveas...