Hello Sharon :)
Welcome too :)
Unfortunately, there are envelopes lost in the way. I participate here with my son, and we have some envelopes lost somewhere in the itinerary. After 90 days, you get your slot back to be sent again. Sometimes, when we write to other members, we and/or they, do validate the register number, so none looses at least, slots. But it will happen always Sharon, some envelopes get lost. In India, in Spain, in Rusia and in the Antartida. There is no difference because of the country, at least for us.
Good luck, and enjoy exchanges :)
Francesc