Numbers up to 4 digits in size will be possible with version 8.5.1 of the LaserWriter print driver. The Print dialog "Copies" and "Pages" fields will support 4 digit numbers. LaserWriter print driver 8.5.1 is available for download from Apple Software Updates sites.
These articles can help you locate the software update mentioned here:
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Where To Find Apple Software Updates" - Lists online services for free Apple software updates.
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Obtaining Apple Product Support in the USA" - Lists 800 numbers and online services for software updates, Apple support information, and a subset of the Apple Tech Info Library.