While there were a number of extensions for Magento 1 that let you change the IDs generated and printed for Magento’s orders, invoices, shipments, and credit memos, I haven’t seen one emerge for. This post from Classy Llama jumps down into M2’s database table and tries to figure out where Magento 2 generates these IDs.
Magento 2’s Starting Order/Invoice/Shipment/Credit IDsastorm
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Quick dispatches from the life of a working programmer.