SIP providers usually sell numbers in contiguous series for businesses. For example, if your company buys a block of 50 numbers, the SIP provider then allocates XXX-5100 to XXX-5150.
But since you’re keeping this strictly internal, you don’t have to worry about that.
Most people are under the impression that the cow is dead before it hits the ground, and way before it even goes in the grinder for processing.