Disclaimer: I am not a lawyer.
The IP is not yours. This is not a situation of 'finders keepers'
Even though you have found some drawings, it is not clear if the IP ownership in those stray drawings was re-assigned during the winding-up procedures. It is quite likely that someone else already owns the IP associated with the former company.
Often in the winding-up procedures there is a catch-all clause about IP and that is re-assigned to banks or other parties who had a claim on the company.
Even though you happen to have found some drawings, that does not give you any rights on the IP associated with them. Possessing the drawings does not give you ownership of the IP.
That would be like suggesting that owning a Picasso print gives ownership of the original. A drawing is just a representation of the idea or IP. Not the IP itself.
If you use it (the IP), and especially if you make money from it, then I strongly suspect that would be illegal. You might be seen as stealing from the assets either of the re-assigned owner, or of the defunct company.
It is not clear from your question if this is an idle intellectual exercise, or whether you are thinking about exploiting the drawings to make money.
If the latter, then I'd strongly advise you to seek proper legal advice, before approaching the receivers or any other party representing the defunct company or its (former) creditors.
Good luck!