From the way you describe it the radio may about 8 to 10 years old. Futaba quit making the Conquest some time ago. Keep in mind that 72 values have dropped alot since 2.4 came out. From your post I can't tell witch battery is missing. A charger will cost about $10. A LA 40 is worth about $30 maybe $40 tops. The radio about $50 today if you can find a buyer.
If I had that plane in my store, I'd price it sell fast between $100 and $120. Just my idea. If you need a TX battery for the radio it could cost you upwards of $30 from Futaba. your OS 32sx is a stronger engine then the LA. Dennis