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dude , have you any idea just how many packages great and small fedex interacts with? that coupled with their Extremely fast delivery guarantees, I think the only way you are fucked is by a hot chick sitting next to you just yearning for it. even UPS they interact with over 1.8 million parcels a month (something like that) they begin clearing routine packages before they reach the shores, and I am sure that MOst are treated as routine.
ups is THE largest shipment company and they only have 100 certified customs brokers, now think about fedex with tighter deadlines, and a smaller company, by far as UPS owns over 85% of the world market.
fedex/ups good call
USPS so-so
DHL OK ultimate to/from central america, i think they have loopholes no one is as efficient to that region.
i think you are GTG bro