[CyaScg]

Is dry ice really that reliable as far as melting time?

I never had problems with it to be honest

Gotchu, do you use a FTID service or do it yourself?

I would do it myself cause you can counter many problems that way.

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For EB, the order has to be extremely light for this to work right (or something where the weight isnt listed on the box)?

Yes. The weight of the item you to SE should be lighter than ~120g.

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@CyaScg  Do you know if the size of the item plays a role at the missing item method?

Did not see that, sorry. That depends on the whole weight, but the weight of the Items shouldn't be as an example 1kg.