# 3 is definitely a Mauser. The stamped trigger guard and what looks to be a curved bolt makes it somewhere in the late WWll production.
WW l and between war mausers were very well made, with all of the parts being made from machined blocks of steel. Even the barrel bands were machined. Every part had the serial # stamped on it. Even during the war, the Germans took pride in what they made, and still machined many parts.
Late WW ll were made as quickly as possible with many parts made from steel stamping, especially the weapons made in other occupied countries.
Also, they were made by various Axis countries and countries that had been over run by the Germans. Many were also made by slave labor.
Many WW ll rifles were parts guns...rifles that had been brought back to an armorer for repair and put back together from various parts containers.
Very easy to tell what model, year of manufacturer, and location made by the markings on top of the receiver, and stamping on receiver sides.
The condition, place of manufacturer will determine it's value...remember, everyone used corrosive ammo back then, and it might be a long time between cleanings, so if bore is pitted or corroded, value goes down.
With firearms, everything comes down to 2 things...
Condition and rarity With the Mauser 98, millions were made, all over the world, even after WWll, so they are not rare. If condition is poor, it might just be a wall hanger worth $100. If in really nice shape, and in shooting condition, could go upwards of $400-$600. A weapon with matching parts with matching serial # will be worth more. German made will also bring a premium over those made in other countries.
There are collectors who will value the hunting rifle over the military, and collectors who value the military weapons, but either way for what you bid, if you get them, you'll do well.
First pic is a WW l...notice the machined parts.
Second pic is an early WW ll version made around 1940, still with the machined parts.