Recently I discovered a large Indian company that have a domain name 5l.in
I have the exact same domain but.com
Wonder if there is something I can do to offer them my domain as a sale.
OK Well that reads as if the domains in either (their own) .IN or .(Your) COM are of no big deal to them, Unless they also do an online version of the magazine. Also If they don't readily publish their contact details they are not seeking Public communications or interaction.
My last suggestion is see if you can make contact with one of their clients featured in their magazine. (for contact details) Personally I wouldn't bother pursuing this one . As mentioned park it wait and leave it at that