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[Iurius]

My box of this game had no registration card...
But even if it had - it seems that Intergalactic Development has closed its doors soon after releasing this game in 1995.

Originally Posted by theinternetismadeofcats

Or perhaps all you received by mail were instructions on how to unlock cases 4 and 5 without having to add any more files.

No - you had to send 5 USD to the developers, and they would send you a 3.5" disk with more mysteries to solve. Those files are definitely missing on the CD - they should have names like "ripper4.mbl", "jackev4.ev" etc. I am afraid they are lost forever - unless some of the developers have saved them and could be still contacted and talked into sharing...