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... and the total amount of packets, meant for computer1, that I've captured on computer2 is a tiny, insignificant fraction of the amount computer1 sent and received during the capture time.
Thus proving my point that the four LAN ports are internally connected to a switch. Mind you this is a common architecture of a home gateway (what you call a wireless router). Such gateways consists of a WAN uplink (either cable modem, optical modem, (A)DSL modem or simply Ethernet from a separate network demarcation point), a NAT / firewall combination, some local network interfaces (ie. WiFi access point, possibly a SIP client and Ethernet). To orderly connect multiple wired LAN devices the Ethernet interface connected through a switch and that is what you see. The switch is learning where each device is, but before it learns the traffic is flooded to all switch ports. That learning usually takes very little time (until a packet comes into the port so that the switch can learn the MAC address of the connected host(s)), therefore the amount of traffic you received is a tiny amount.
