This can't be generalized. First, I don't know the specific weight, but I know it's three iron boxes. Generally speaking, the tin box package is 10 package, with 5 grams per package, almost 50 grams per box. But the specifications of the tin box are not clear, let's say 150g. The second is the quality. The quality of Jin Junmei is uneven. The good ones can be sold for 3,000-5,000, and the poor ones are thousands. But it mainly depends on the quality of tea. Some are brought back from other places and sold as Jin Junmei. But the price should not be very cheap. I estimate that you should have at least 800-900.
One more thing, since it's from a friend, he must have put you in a good position. I don't care if it's expensive, as long as you like it, don't I?