The MDD is quite specific about the information that is placed on the device packaging and labelling
13.3. The label must bear the following particulars:
(a) the name or trade name and address of the manufacturer. For
devices imported into the Community, in view of their distribution
in the Community, the label, or the outer packaging, or
instructions for use, shall contain in addition the name and
address of the authorised representative where the manufacturer
does not have a registered place of business in the Community;
(b) the details strictly necessary to identify the device and the contents
of the packaging especially for the users;
(c) where appropriate, the word ?STERILE?;
(d) where appropriate, the batch code, preceded by the word ?LOT?,
or the serial number;
(e) where appropriate, an indication of the date by which the device
should be used, in safety, expressed as the year and month;
(f) where appropriate, an indication that the device is for single use. A
manufacturer's indication of single use must be consistent across
the Community;
(g) if the device is custom-made, the words ?custom-made device?;
(h) if the device is intended for clinical investigations, the words
?exclusively for clinical investigations?;
(i) any special storage and/or handling conditions;
(j) any special operating instructions;
(k) any warnings and/or precautions to take;
(l) year of manufacture for active devices other than those covered by
(e). This indication may be included in the batch or serial number;
(m) where applicable, method of sterilization;

in the case of a device within the meaning of Article 1(4a), an
indication that the device contains a human blood derivative.
The labelling does not specifically be on the actual product (in this case plaster) but if you are drawing devices from various sources with different use by dates, lot numbers etc. It would be easier for it to be on the product itself.
In addition if the device is sterile, the CE mark must also bear the number of the notified body who accredit the sterilization process for the manufacturer. As pads38 said, the "easiest" way around this is an OBL agreement between you and the original manufacturer.