It may be simply cannabisseeds.com never received / cashed the money order?
-or perhaps they did, but misassign payment to another customer? ...clerical errors can happen with the best of businesses.
-or perhaps they received the money order, shipped product, but for some reason it didn't get through... perhaps intercepted, etc ... or maybe the item was misaddressed...
On an aside, when we sold tie-dye t-shirts, we ran into numerous problems with incorrect addresses ... transposed house / po box number, incorrect formatting of address (mainly an issue with non-U.S. orders) missing postal code, etc.
There is usually more to the story ...
That certainly appears to be the case with the post regarding Herbal Smoke Shop ...
Even though one may get a receipt, that doesn't mean they will ultimately be charged - most merchants, and I'm talking even big ones like Amazon, will often process credit credit card orders as "Auth-Only" and then at some later point, such as upon shipping, submit the charge amount for settlement.
On an aside, most gas stations "Auth-Only" around $50 (credit card issuers, in particular epassporte, are free to adjust various auths even higher) before allowing the pump to operate and then submit the actual amount of gas pumped - people who pay with debit cards (tied to a person's bank account) do so at a risk of overdrawing their bank account because sometimes a merchant doesn't remove an "authorization" (and/or submits the actual charge for settlement separately) can sometimes remain in place for upto a max of 30 days; most often only the merchant is permitted to remove it - credit card company often can't help other than maybe temporarily raising one's "open to buy" (credit limit) until the authorization drops off ... anyways rambling on as I often do LOL!
With all that said, sometimes for various reasons a merchant will choose to void (not submit any charge for settlement) a transaction - merchants, depending on the circumstances, may or may not notify the customer the charge was voided and their card not actually charged.
In short, even with the best of vendors, sometimes things don't go as smooth as one would like - however, it's not always totally the vendors fault - often there is usually more to the story...
Ron