Oh that's a bit harsh (once it's lost, it's lost).
I have to buy my dd a 'real world' bus pass, it costs me £360 for the year and she can ride any bus as often as she likes within the bus company's routes. If she loses it there's a £25 admin fee to replace it. If it's stolen it's replaced free of charge. They can do this because the bus passes carry each child's photograph on them, making them useless to all but the most ruthless of children or adult (a child's pass differs from an adults).
Good idea about the springy thing, I think it would be easier for boys than girls though - girls are so .................. shall we say 'awkward' about these things (see previous threads on Everything Else with regards to bags, pencil cases, coats, shoes, hair, make-up, nails, coverings for books, etc etc etc