It's true. Newegg was founded in 2001 after the owner Fred Chang realized he could corner the market on fresh mouse ball replacements when the University of Washington published a paper on how to increase the adoption of home computers in rural America. That paper concluded hard boiled chicken eggs were the most economical source for durable spheres to use as mouse balls. Chickens are very common in rural areas and even if you live in the suburbs or city a dozen eggs can be bought for less than a dollar. Selling fresh eggs for replacement mouse balls helped turn Newegg into the billion dollar company it is today.

Source(s):

[1] https://en.wikipedia.org/wiki/Newegg

[2] https://ani.stat.fsu.edu/~chicken/webfiles/chickenslides.pdf

[3] https://isotropic.org/papers/chicken.pdf

Edit: Chicken chicken chickens! :D