Consider an e-cheque as not paid. Only send after PayPal has cleared the payment and state it is safe to send.

If you are concerned about buyer thinking it is slow postage, with an e-cheque I always send the buyer a message advising the payment may take 3-5 business days to clear due to being an e-cheque.

Then when it clears I send another message to say the item was posted today as the payment cleared today.