Recently I got a new never run K&B .45 Sportster R/C with optional bulkhead back mount sans box and docs, winning bid $40 + $13 shipping + sales tax. OTOH another in box was $85 starting.
Yet, I was able to get a muffled Cox .09 Medallion R/C in new never run without box and docs for under $40 2 years ago. Sometimes things go for crazy prices, other times, you catch it just right, and get it for a reasonable price, so it is hard to say.