Here are my 4T and L42 cases. I took the plunge and started working the paint with acetone. On the 4T case, I found the "Woolwich Arsenal" stencil. End tag matches my rifle serial #. Also kept the original receipt from the previous owner when he ordered it from the Hunters Lodge. Check out that price!
On the L42 transit case, the acetone revealed a previous rifle/scope combination. The paper end-tag matches the rifle and scope. I didnt venture any deeper through the paint. There are many more coats, and I didnt want to lose its history as Mr Laidlerpointed out.