Corrosion on Montherboard

Dec 6, 2018
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I recently purchased an HP Envy 360 in April. It stays at my office and it has never been touched by liquid. About 2 months ago in September my computer began to not hold a charge and I would have to keep it plugged in so wouldn't die. It's under warranty at Best Buy so I brought it to them long story short after about four weeks of hearing nothing and status updates saying the computer had been repaired and then mysteriously being shipped off again, they are now telling me that the motherboard has liquid damage and they will not cover that and want me to pay an extra $450. My question is, do these pictures look like liquid damage on the 8 to any of you?

http://imgur.com/gallery/KKGRRyM