Vintage silver tobacco storage box with initials

The age is indeterminable, most likely from the pre-war period in Latvia, as there is no bottom part where the hallmark might have been. The antique shop said it's likely 800 or 875 hallmark with gold plating inside. Certification costs a relatively large amount of money. Interestingly, the lid has different initials than the sides of the box, presumably the master's. Length 10 cm, width 5 cm, height 1.5 cm. Weight 75 g.