Plastic wiper nut caps (missing)

[ryanpw3]

Hi All,

Not too happy, but when spraying my car in a self serve car wash today, I noticed both of the little plastic caps that cover the nuts secuting the windshield wipers to the car are gone. I'm not sure if they were sprayed off while washing the car (couldnt find them), or if it's a function of the near 0 temps and freezing for the last two weeks while sitting at the office.

Either way they are gone. What are my options, as it looks ugly? I have my 12K service scheduled for Sat morning at the dealership, but wanted some info ahead so I don't get raped buying a couple plastic caps. Any chance that would be covered via warranty?

Thanks!