Muscovy eggs are incredibly difficult to artificially incubate successfully. Shipping eggs just decreases the possibility of success. Your best bet would be to put them under a broody & let her and mother nature do the work. Some people report great success but I'm skeptical of a lot of those reports. You can have great fertility & get your ducklings to 33, 34 days and they'll die in the shell after pipping.
If you can at the very least start eggs under a bird for a week to ten days the odds of a successful hatch increase. I've had outstanding luck putting eggs in the incubator that have already been started by the bird whether it be because she abandoned the nest or in cases where there were eggs of varying stages of incubation in a nest & the duck took her clutch off leaving a few viable eggs in the nest, whatever.
I have and will ship Muscovy eggs occasionally but I always warn the buyer that I feel it's very risky & I include on average 3 extra eggs in each order, more if I can fit them in the box.
