Wow... This is your very first posting, and you came out full caps and guns blazing Perhaps a little more detail might allow us some clarification of what you need.
At the time of your leaving (work?) was the Particle Photon powered up and connected to Blynk's Cloud server? If so, then you just need to connect to that same server...NOT your offices IP.
If the default setting in the app (to Blynk) is not working, then you can ping blynk-cloud.com from a PC to get the IP to place in the custom setting, or PM @Dmitriy, as requested, and he can pull that info from their side.
If however you have setup a Local Server, also at work, then well... ya... you need that public IP and have previously setup port forwarding.
BTW, this is all standard IoT type networking configuration... not "Blynk's Fault"