Got a package the other day and Aus post had to repackage the card as they seller only used a paper envelope which had been shredded. Card was still in fine condition due to the holder.
If it was on eBay then I wouldn't leave a negative unless you asked about the postage method and they stipulated bubble mailer, if it was a trade from here and you hadn't agreed upon a white envelope then I would say negative.
JMHO