didnt the Finns also capture a lot of tanks and guns and other materiel?
Very much indeed, from small arms, tanks, artillery to even cavalry horses. I think the more astonishing numbers is when the soviets retreated and made it back to the Soviet-Finnish border they had 1,001 dead, 1,430 wounded, 82 suffering severe frostbite, and over 2,000 missing! This was a battle of (Finn) 11,000 men vs. (Soviet) 45,000 plus. The use of landline communication and no radio silence was key. The Finns new almost every detail to their operations and elemental objectives.