My experiences with newegg.ca and newegg.com have always been good.
I always buy "New", not "Used/Refurbed", if that makes any difference.
Canadian consumer law requires all Canadian vendors (like newegg.ca) accept returns for full refund or for "equivalent value" exchange within 30 days. Regardless of the item type, without any need for the item to be damaged or defective, the consumer only needs to state that he/she "isn't satisfied with the product". This is the law, it always supersedes any vendor-imposed rules about "we don't accept returns/exchanges on [whatever] after product is open, etc". Although vendors can impose "restocking fees" or (excessive) shipping/freight charges to discourage (or recoup costs) of bad business, and vendors can choose to reject business from any customers they just don't want to deal with.
ASUS motherboards seem to always come in hugely oversized boxes filled with extra advertising and extra packaging materials. I've had a few ASUS products arrive in slightly damaged packaging - suggesting some dropping, crushing, rough handling or other abuse during stocking/shipping - I've even had a huge ROG Swift monitor box arrive with very obvious forklift damage - but the ASUS contents themselves remained completely intact.
"All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams
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