One week before, e-mail the intended recipient to check they will be in lab. Doublecheck the address. Room number, street address and phone number are very important.
Yeast strains for scientific research only, samples without commercial value.
Put them on two sides of the box and label the box as to the weight of dry ice that it contains, in kilograms. This is essential for all air shipments. Packages containing dry ice and going abroad also require three copies of a shipping invoice listing the shipper, recipient, and describing the value and contents of the package. Only FedEx on Mondays or Tuesdays. This way you'll have the rest of the week to deal with problems, should they arise.