I have got an 9,3x53R Sako box from Finland which was a big surprise. Bokmal found it for me in the shop of an old gunmaker.
Seems to be like any other Sako box but the cartridges have the headstamp "Lapua 9,3x53R". I can only assume that Sako and Lapua had have very close relation's in this time and Lapua was making brass for Sako because of some reason's. It don't look like the cartridge's were not original in this box. Only real difference to Sako headstamp cartridge's is a heavy crimp and annealed brass.

again the ballistic twins 9,3x53R and 9,3x57 side by side
same powder load, bullet and velocity