I am looking at purchasing a used Hova-Bator 1588 Genesis series from craigslist. They say it is in good working order and hold temp and humidity. And they also stated it was only used for 47 days. It does not come with packaging and possibly no manual. What are some things I should look for and be aware of when buying used? Any major red flags I should look for? And what would be a fair price? Sorry for all the questions!