depends if you have static/dynamic or dynamic-IP/port nat
in static (1:1) and dynamic (n:n), the source IP is simply changed, in dynamic ip/port the source port will also be changed
the firewall enters the translation pair into it's state table and expects to receive a packet fromn the original destination, to the translated source on the translated (or not, if static/dynamic) port coming from the original destination port and upon receiving such packet, translates in reverse and delivers the packet to the original source, then doing the same with the final ack and returning psh/fin/...)
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