Shipping - Envelope question

Guys,

I am waiting for order sent from NL within EU. I am 99% sure vendor has sent and it should be landed Thurdstay or Friday last week. He also informed me that sent my order in bubble/padded envelope. I had in past around 40 successfully deliveries from NL and I am pretty sure all was arrived in flat envelopes. Don't remember but i have read that flats are sorted by machine without human interaction. And I am wonder if bubbles are trades the same or makes more attentions and they are checked manually on mail centers ? Orders is 6grams and for sure fit to mailbox. I am just curies if flat envelopes for international shipping are safest than bubbles


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