You should ask the seller if your allowed to transfer the license “you purchased” to (following name…, Company…., etc.) that is going to do this and that with the work (explain in detail).
The company you work for (or works for you) would like to have something on record I presume?
Because normally your not allowed to transfer the license (sub-license), so they would like to see some written and signed permissions from the original copyright holder giving them the rights/permissions to do this and that with the work, right?
The seller needs to know who your transferring the license to and know what that company is going to do with the work so he can create a custom license for them should he deem it needed.
For example, if that company is going to use the content for in game purchases then I presume the original creator would like to know about it and maybe create some per amount of users license or something like that, the company you work for would also like to know about this and have it all on record, right?
So in this type of cases you should always talk with the original copyright holders of the work and be transparent about what are the plans, come to some agreements about it (because real owner is the only one qualified to set the terms) and get this on paper. If the owner of the work is not equipped to deal with this type of cases then you should simply not go forward with your plans using that work in some license transferring deals.
This is just advice of a fellow artist,