Another Aussie here.
I would say that "a couple" can also mean several. For example:
"Come back in a couple of days and we might have them in stock".
"Turn right where the old farmhouse used to be and they are a couple of k's down the road"
I would say that "a couple" can also mean several. For example:
"Come back in a couple of days and we might have them in stock".
"Turn right where the old farmhouse used to be and they are a couple of k's down the road"
I'd allow that "a couple" could mean "2 that I'm certain about, but possibly 3 or maybe even 4".