How to move all orders to a new fulfillment location?

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My store is currently using a 3PL fulfillment service that we are discontinuing. 


We have several hundred open orders where the order is still set to be the 3PL's fulfillment application. Is there an easy way for me to change the location to our own in house fulfillment so we can generate USPS labels?

I am fine deleting the 3rd party app as well if that would work.