How particular are Collect+ about the exact sizing of your parcel. I’m needing to send something around 600x150x100mm, but notice that they quote a parcel size of 50x30x30cm. Have you ever had anything rejected for being oversize?
I just dropped off a package at a Collect+ collection point – my local petrol station – which was a tad oversized, though not as much as yours sounds to be, and they didn’t bat an eyelid. Obviously I can say that’d be the case elsewhere, but they were okay with that. I guess you could always ask in advance rather than pay online and then find they won’t take it.
I used them before to return something to CRC and it got to them just fine, if a little slowly.