Could you tell me what my 2 keys 129-L-7 National Lock Co. Rockford would unlock?

The 129-L-7 keys from National Lock Co. are typically used for various types of padlocks, cabinets, or lockers produced by the company. The specific locks they unlock would depend on the model and application for which the keys were designed. If you have a lock with the same key code, those keys should fit. For precise identification, consult the manufacturer's specifications or a locksmith.