Sending suitcases from Europe to Delhi

I was connecting in Europe on the way from the US but it was on a different airline and they had different rules so had to leave 3 suitcases behind with my friend in Brussels. They’re full of children’s clothes etc. Was wondering if anyone can suggest a cheap way to get these three suitcases from Brussels to New Delhi.

Box them all up in one carton and send them by sea. Count on a month perhaps to get to a seaport and needing some serious airing afterward, they will be pretty stinky after a sea voyage, but it will be the cheapest way. I sent stuff from India as regular cargo but you will have to pay for a minumum of one cubic meter to do that. Check out Sea Mail for smaller amounts, might be cheaper.