What leads you to believe that you will receive a brand-new device following presumed failure of your iPad?
Beyond Apple's 14-day unconditional returns period, device failures are a warranty matter. In the first instance, you should seek assistance from the retailer from which the device was originally purchased. Warranty claims do not require the original packaging, but invariably do require you to provide the original purchase receipt.
If purchased directly from Apple - or if you seek redress under Apple's limited one-year manufacturer's warranty - in lieu of repairing and returning your own iPad, Apple will usually exchange a qualifying iPad for a renewed/refurbished iPad of the same model and specification. For non-warranty repairs (if applicable) the cost of a repair-exchange is the same as would otherwise be charged for a repair. Unless you have benefit of an active AppleCare plan, an out-of-warranty repair while expensive will be somewhat less than the cost of a replacement iPad.
As for out-of-warranty repair costs, Apple offers a fixed-price price repair. You can verify eligibility and cost for your region/country here:
iPad Repair & Service - Apple Support
If you have an active AppleCare+ plan, the cost of repair is reduced to a small excess/deductible fee.
If seeking assistance from Apple, your best option will be to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad - and you can explore your available options:
Genius Bar Reservation and Apple Support Options - Apple