Unfortunately for him, it would not last long. After completing his trial, he and the Companions celebrated in true Nord fashion... with lots of drinking and feasting and singing. After hours of celebration, the drunken Imperial went to bed, unaware that he had removed his rings and dropped them on the floor beside his bed.
The next morning, he was awakened by Skjor with the promise of a large contract by the Jarl himself. In his hungover state, the Imperial took the contract, and proceeded to the bandit camp where the target was located. However, when faced with the bandit leader's minions, it didn't take him long to realize his mistake... he had forgotten his rings!
Two days later, Vilkas and Farkus found his body after he didn't return and went to complete the contract.
This mod contains the rings in this story. You'll find them in the Jorrvaskr Basement hidden behind a chair. However, since they are in the Companions' mead hall, they are technically their property, so just walking in and taking them without joining the Companions first is considered theft. These rings are also disenchantable so that you can apply their enchantments to armor... or if you've mastered Enchantment, you can combine the two enchantments onto a single ring.
However, if you can't do that, then one of the rings uses duggelz's Left Hand Rings mesh so that you can wear both rings at once.
UPDATE: For those who want to have to work for getting these rings, I uploaded a version that puts them in the final room of Dustman's Cairn.
Enjoy.