I'm very sorry that I forgot to mail you two of the samples last time. Both samples have been mailed out along with Lily's goods via Fedex. Please be on the look out for them.
I'm sorry that I forgot to send two of the samples to you last time. The two samples have been sent off with LIly's goods through Fedex. Please find the two samples enclosed.
I am sorry that I forgot to send you two of the samples last time, which will be sent with Lily's cargo this time with Fedex, Please note that check delivery,
I apologize you for leaving two of samples undelivered last time and they have already been arranged to send with Lily's goods via Fedex, Please note to check&receive.