I'm surprised that dump will print all items in a coll, but won't put them all into a single message as far as I've tried. I must be doing it wrong - I thought "all at once" was kind of the meaning of dump!
Thanks everyone! I get it now - totally misunderstood what was happening. Of course I only saw the last entry of the coll dump to a message box because that was the last it received, not the only message, which is what I thought was happening :P
And yes I see it is rather useless for my current purposes to collect this all as a list. Thanks again :)