My brother and I are going to Namibia in May. I will be taking a 9.3x62 donation rifle and a .458 double. I want to also take a little 9.3x62 Mauser. My brother is only taking one rifle a .338 Win. Can he put the donation rifle or my litttle Mauser in his gun case as long as I have all three on my Namibian gun form you fill out at the airport?