The Mauser is not sporterised, it is a gunsmith built rifle using a probable FN manufactured receiver. These were available from Brownells for decades. The condition is poor though. I see a lot of rust pitting. Value because of the rust will be low.
The .380 ammo is tricky. The boxes alone, if in good shape, are worth 20 to 30 bucks. This one is probably worth 15 to 20. The ammunition inside it is tricky. If it was stored in a cool dry condition it will be fine to shoot and at this time worth about a buck a round.
If it was in a garage and went through multiple cycles of hot and cold then it is dangerous and only worth about 10 cents a round. That's what the brass and projectile are worth.
The powder and primers would need to be burned.
The Lyman Alaskan scopes are very desirable. Depending on condition and reticle they sell for between 150 and 550.