There are various benefits of having your box printed, branding, quality, and product identification, bar code etc. However there are some legal requirements for printing on box's for the packaging of hazardous goods and chemicals. It is important that you check the actual requirements for your product. See Graphic Design and Printing on Corrugated

Samples
Samples are generally provided to confirm the size of a new job. It is very important that this sample is checked with the full content of the actual goods. It is important to point out that samples are generally hand made sample either hand cut, cad cut or laser cut. The actual sample produced will appear to vary slightly in board thickness from factory production because of the effect of pressure on the flutes on box's produced through the factory.

Prices quoted are generally valid for 30 days unless agreed otherwise. Allow for possible variation in unit packaging cost if you are using a price quoted for some tender that may be many months ahead.

The colour of the corrugated board liner may change slightly either between runs or even during one production run. This can be due to many factors, commonly it is due to the fact that the origins of the actual liner may be different, however the actual specification of the paper would be unchanged and it is purely a visual difference and performance would not be effected by a slightly different colour.