It will be fine
Hi Val1erian,
Assuming the telescope has spent nearly all or all its time inside the shop and in a glass case is very, very unlikely to detract from anything about its use.
Skywatchers are have SIO2 over-coated optics, so it is extremely unlikely the coatings will be affected save for a tiny bit of dust which can, if needed, be washed off. Don't be overly scrupulous about washing mirrors. Follow the first tenet of the Hippocratic oath -- first, do no harm. A little surface dust really does detract little if any from the view.
Get out and enjoy it and rejoice in the discount you received.
Best,
L.
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