Many years ago, not long after we had settled in Crete, my husband had kidney problems and underwent an exploratory operation at Rethymno hospital. The consultant told me that he had found nothing untoward, but to be on the safe side he had taken tissue for a biopsy.
Unbeknown to me the hospital had no lab for analysis, and the town in those days had no microbiology lab either. “What you must do is send it to Chania, to Dr X’s laboratory”. Me: "How do I do that?”
Doc (handing me a mercifully opaque plastic pot containing the relevant bit of my husband): Why, just pop it in an envelope addressed to Dr X, and hand it in to the bus station. She will collect it from there. You phone to tell her to expect it, and later phone to get the result”.
Somewhat to my surprise it all worked out fine (including the all-clear from the biopsy).And I went on over the years to send all sorts of items by bus. Cretans do it all the time without a second thought - as with the lamb.
If the people at Vamos will agree to take your parcels to Chania bus station, and you can sort our payment with them, you're in business. Probably about five euros apiece, or less if they're fastened together as one. Don't waste money on a taxi - use the nice old-fashioned but safe, efficient and very cheap service offered by KTEL.