Image tagging
The description page needs to have on it:
The name of the person or company that created the image
A tag showing the type of permission they gave you - in other words, if they agreed to release it under the GFDL, just add  to the page
A statement like "The owner of company XYZ agreed to release this image under the GFDL in personal correspondance"
That will suffice until someone handles the m:OTRS ticket.  I am not a user on that system, so I have no ability to look it up, but if it takes more than a few days, we can  contact someone listed at m:OTRS#Permissions.