onesizeさん、ご回答ありがとうございます。
とりあえずe@オプションを入れたもので.Trashesに続く行を調べてみました。
違いはありますが意味はわかりません。
ls -ale@ /volumes/A (ゴミ箱使用可能な方)
drwx---r-x@ 4 ユーザ名1 501 136 1 8 00:22 .Trashes
com.apple.FinderInfo 32
0: C03E745D-7333-4C12-984B-67D9A34F4ECF allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
1: group:admin allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
2: user:ユーザ名2 allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
ls -ale@ /volumes/B (ゴミ箱使用不可の方)
drwx---r-x@ 4 501 501 136 1 5 17:47 .Trashes
com.apple.FinderInfo 32
0: user:ユーザ名1 allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
1: user::ユーザ名2 allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity
2: group:admin allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity